5.1.1 The Need for Homeostasis Flashcards

1
Q

What physiological factors are controlled by homeostasis

A
  • Body temp
  • Metabolic waste
  • Blood pH
  • Glucose concentration
  • Water potential
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2
Q

What are the 2 communication systems in mammals?

A
  • Nervous system
  • Endocrine system
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3
Q

What are hormones?

A
  • Chemical substance produced by endocrine gland
  • Transmit information from one part of an organism to another to bring about a change
  • Control functions that dont need INSTANT response
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4
Q

Types of glands in body

A
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5
Q

Why does pH need to be controlled?

A
  • Enzymes have optimal pH
  • Hydrogen bonds and ionic bonds can be broken by altering concentrations of OH- and H+ ions
  • Changes tertiary structure of protein
  • Shape of active site of enzyme changes
  • No longer complementary to substrates
  • Substrate complexes cannot form
  • Enzyme is denatured
  • Cannot perform its function
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6
Q

Why does blood glucose concentration need to be regulated?

A
  • Glucose concentration in blood affects water potential of blood and availability of respiratory substrates for cells
  • Glucose needed for cellular respiration
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7
Q

How do stomata carry out a homeostatic response?

A
  • Guard cells open and close
  • Regulating volume of gases in and out of leaves
  • Monitors transpiration rate
  • So regulates water loss in plants
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